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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804bf09283a4eb404ddcba07a00c3eb74111a62fe77c5f6494af2155e7c51bb6' 
  AND token = '9tPwRxrepdxsXP1w7c1cFNKmYOiyNO9oPSDuyUz9b7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}